Ok, I decided to extend HtmlCommandLink directly instead of UICommand
for my UITabLabel. It appears this works. No more ClassCastException.
Everything displays correctly.
However, I am still puzzle as to why this works. Because HtmlCommandLink
subclasses UICommand, thus I should be able to do this:
(HtmlCommandLink)component).getOnclick();
Assumming the above is what was causing the ClassCastException.
On Thu, 2005-07-28 at 11:12 -0700, Curtney Jacobs wrote:
> I might have narrowed down the ClassCastException to the following
> method in
> "org.apache.myfaces.renderkit.html.HtmlLinkRenderBase.renderJavaScriptAnchorStart"
>
> I am not to sure, but the ClassCastException could be comming from
>
> ((HtmlCommandLink)component).getOnclick();
>
> I am viewing the source code via browser, unfortunately no line number
> comes with it, so I cannot narrow to which cast is causing the error. It
> says line 323. Perhaps someone can? I have included the function below
>
> Hmm?
>
> protected void renderJavaScriptAnchorStart(FacesContext facesContext,
> ResponseWriter writer,
> UIComponent component,
> String clientId)
> throws IOException
> {
> //Find form
> UIComponent parent = component.getParent();
> while (parent != null && !(parent instanceof UIForm))
> {
> parent = parent.getParent();
> }
>
> UIForm nestingForm = null;
> String formName;
> DummyFormResponseWriter dummyFormResponseWriter;
> if (parent != null)
> {
> //link is nested inside a form
> nestingForm = (UIForm)parent;
> formName = nestingForm.getClientId(facesContext);
> dummyFormResponseWriter = null;
> }
> else
> {
> //not nested in form, we must add a dummy form at the end of the
> document
> formName = DummyFormUtils.DUMMY_FORM_NAME;
> dummyFormResponseWriter =
> DummyFormUtils.getDummyFormResponseWriter(facesContext);
> dummyFormResponseWriter.setWriteDummyForm(true);
> }
>
> StringBuffer onClick = new StringBuffer();
>
> String commandOnclick;
> if (component instanceof HtmlCommandLink)
> {
> commandOnclick = ((HtmlCommandLink)component).getOnclick();
> }
> else
> {
> commandOnclick =
> (String)component.getAttributes().get(HTML.ONCLICK_ATTR);
> }
> if (commandOnclick != null)
> {
> onClick.append(commandOnclick);
> onClick.append(';');
> }
>
> //call the clear_<formName> method
>
> onClick.append(HtmlRendererUtils.getClearHiddenCommandFormParamsFunctionName(formName)).append("();");
>
> String jsForm = "document.forms['" + formName + "']";
>
> if
> (MyfacesConfig.getCurrentInstance(facesContext.getExternalContext()).isAutoScroll())
> {
> JavascriptUtils.appendAutoScrollAssignment(onClick, formName);
> }
>
> //add id parameter for decode
> String hiddenFieldName =
> HtmlRendererUtils.getHiddenCommandLinkFieldName(formName);
> onClick.append(jsForm);
> onClick.append(".elements['").append(hiddenFieldName).append("']");
> onClick.append(".value='").append(clientId).append("';");
> if (nestingForm != null)
> {
> HtmlFormRendererBase.addHiddenCommandParameter(nestingForm,
> hiddenFieldName);
> }
> else
> {
> dummyFormResponseWriter.addDummyFormParameter(hiddenFieldName);
> }
>
> //add child parameters
> for (Iterator it = component.getChildren().iterator(); it.hasNext(); )
> {
> UIComponent child = (UIComponent)it.next();
> if (child instanceof UIParameter)
> {
> String name = ((UIParameter)child).getName();
> Object value = ((UIParameter)child).getValue();
>
> renderLinkParameter(dummyFormResponseWriter, name, value,
> onClick, jsForm, nestingForm);
> }
> }
>
> // target
> // todo: can we eliminate the if and rely on the second call only ?
> // see MYFACES-310, specifically the comment by Emond Papegaaij. Will
> try
> // after testing framework is in place & tests are written.
> String target = null;
> if (component instanceof HtmlCommandLink)
> {
> target = ((HtmlCommandLink)component).getTarget();
> }
> else
> {
> target = (String)component.getAttributes().get(HTML.TARGET_ATTR);
> }
> if (target != null && target.trim().length() > 0) {
> onClick.append(jsForm);
> onClick.append(".target='");
> onClick.append(target);
> onClick.append("';");
> }
>
> // onSubmit
>
> onClick.append("if("+jsForm+".onsubmit){"+jsForm+".onsubmit();}");
>
> //submit
> onClick.append(jsForm);
> onClick.append(".submit();return false;"); //return false, so that
> browser does not handle the click
>
> writer.startElement(HTML.ANCHOR_ELEM, component);
> writer.writeURIAttribute(HTML.HREF_ATTR, "#", null);
> writer.writeAttribute(HTML.ONCLICK_ATTR, onClick.toString(), null);
> }
> On Thu, 2005-07-28 at 09:57 -0700, Curtney Jacobs wrote:
> > Greetings Eric,
> >
> > what you have listed would just recursively call my encodeBegin() method
> > in my renderer class, since this is where I am calling encodeRecursive
> > () method in the first place. However, I did tried it and got errors, as
> > expected. From what I have read and understood the UITabLabel suppose to
> > use its own renderer to display itself.
> >
> > Has anyone else ran into this problem before?
> >
> > Curtney
> >
> > On Thu, 2005-07-28 at 08:22 -0500, Eric Kelm wrote:
> > > I had problems when I tried to use this example as well. Look at the
> > > method
> > > signatures. If I remember correctly the functions are not being called
> > > correctly. E.G.
> > >
> > > Method signature:
> > > public void encodeBegin(FacesContext context, UIComponent component)....
> > >
> > > Method Usage in the example:
> > > {...
> > > component.encodeBegin(context);
> > > ...}
> > >
> > > Method should be:
> > > {...
> > > encodeBegin(context, component)
> > > ...}
> > >
> > > I believe this is correct. There are other places in the code like this
> > > as
> > > well. I believe this is a correct solution/
> > >
> > > ---------
> > > Eric Kelm
> > > Developer, VSG Worldwide LLC
> > > Longview, TX 75601
> > >
> > > ->-----Original Message-----
> > > ->From: Curtney Jacobs [mailto:[EMAIL PROTECTED]
> > > ->Sent: Thursday, July 28, 2005 3:46 AM
> > > ->To: [EMAIL PROTECTED]
> > > ->Cc: MyFaces Discussion
> > > ->Subject: Re: ClassCastException calling encodeBegin
> > > ->
> > > ->The following is an abbreviated (My stacktrace is really long) version
> > > ->of my stacktrace:
> > > ->
> > > ->java.lang.ClassCastException: com.oim.faces.custom.tabbedpane.UITabLabel
> > > -> at
> > > ->org.apache.myfaces.renderkit.html.HtmlLinkRendererBase.renderJavaScriptAnc
> > > ->horStart(HtmlLinkRendererBase.java:323)
> > > -> at
> > > ->org.apache.myfaces.renderkit.html.HtmlLinkRendererBase.renderCommandLinkSt
> > > ->art(HtmlLinkRendererBase.java:215)
> > > -> at
> > > ->org.apache.myfaces.renderkit.html.HtmlLinkRendererBase.encodeBegin
> > > ->(HtmlLinkRendererBase.java:146)
> > > -> at javax.faces.component.UIComponentBase.encodeBegin
> > > ->(UIComponentBase.java:317)
> > > ->at com.oim.faces.custom.tabbedpane.TabbedPaneRenderer.encodeRecursive
> > > ->(TabbedPaneRenderer.java:406)
> > > ->
> > > ->
> > > ->As you can see from the above, what triggers the exception is when I
> > > ->call encodeRecursive in my renderer, which calls encodeBegin() method on
> > > ->my component (UITabLabel). See previous post for implementation details.
> > > ->
> > > ->_Curtney
> > > ->
> > > ->
> > > ->On Thu, 2005-07-28 at 10:25 +0200, Martin Marinschek wrote:
> > > ->> Find out which classes are involved in the failed casting and then get
> > > ->> back to us.
> > > ->>
> > > ->> regards,
> > > ->>
> > > ->> Martin
> > > ->>
> > > ->> On 7/28/05, Curtney Jacobs <[EMAIL PROTECTED]> wrote:
> > > ->> Greetings!
> > > ->>
> > > ->> I have copied a custom component from "JavaServer Faces" by
> > > ->> O'Reilly to
> > > ->> use in my myfaces application and I am getting
> > > ->> ClassCastException
> > > ->> whenever I call "component.encodeBegin(context)": The
> > > ->> following code is
> > > ->> what throws the ClassCastException:
> > > ->>
> > > ->> Calling code:
> > > ->>
> > > ->> UITabLabel tabLabel = (UITabLabel)child.getFacet("label");
> > > ->> encodeRecursive(context, tabLabel);
> > > ->>
> > > ->> Called Method implementation:
> > > ->>
> > > ->> private void encodeRecursive (FacesContext context,
> > > ->> UIComponent
> > > ->> component) throws IOException {
> > > ->> if (!component.isRendered()) {
> > > ->> return;
> > > ->> }
> > > ->> //throws ClassCastException
> > > ->> component.encodeBegin (context);
> > > ->>
> > > ->> if (component.getRendersChildren()) {
> > > ->> component.encodeChildren(context);
> > > ->> } else {
> > > ->> Iterator it = component.getChildren
> > > ->> ().iterator();
> > > ->> while (it.hasNext()) {
> > > ->> UIComponent child =
> > > ->> (UIComponent)it.next();
> > > ->> encodeRecursive(context,
> > > ->> child);
> > > ->> }
> > > ->> }
> > > ->> component.encodeEnd(context);
> > > ->> }
> > > ->>
> > > ->>
> > > ->> The following is the custom component from the Book:
> > > ->>
> > > ->> public class UITabLabel extends UICommand {
> > > ->>
> > > ->> public static final String COMPONENT_TYPE =
> > > ->> "com.oim.faces.TabLabel";
> > > ->> public static final String COMPONENT_FAMILY =
> > > ->> "javax.faces.Command";
> > > ->>
> > > ->> public UITabLabel () {
> > > ->> super();
> > > ->> setRendererType ("javax.faces.Link");
> > > ->> }
> > > ->>
> > > ->> public String getFamily () {
> > > ->> return COMPONENT_FAMILY;
> > > ->> }
> > > ->>
> > > ->> public void broadcast (FacesEvent event) {
> > > ->> if (event instanceof ActionEvent) {
> > > ->> processAction((ActionEvent)event);
> > > ->> }
> > > ->> }
> > > ->>
> > > ->>
> > > ->> private void processAction (ActionEvent event) {
> > > ->> UIComponent panelTab = getParent();
> > > ->> UIComponent panelTabbedPane =
> > > ->> panelTab.getParent();
> > > ->> Iterator it = panelTabbedPane.getChildren
> > > ->> ().iterator();
> > > ->> while (it.hasNext()) {
> > > ->> UIComponent panel =
> > > ->> (UIComponent)it.next();
> > > ->> if (panel.equals(panelTab)) {
> > > ->> panel.setRendered(true);
> > > ->> } else {
> > > ->> panel.setRendered(false);
> > > ->> }
> > > ->> }
> > > ->> }
> > > ->>
> > > ->> public MethodBinding getAction () {
> > > ->> return null;
> > > ->> }
> > > ->>
> > > ->> public void setAction (MethodBinding action) {
> > > ->> throw new UnsupportedOperationException();
> > > ->> }
> > > ->>
> > > ->> public MethodBinding getActionListener () {
> > > ->> return null;
> > > ->> }
> > > ->>
> > > ->> public void addActionListener (ActionListener
> > > ->> listener) {
> > > ->> throw new UnsupportedOperationException();
> > > ->> }
> > > ->>
> > > ->> public ActionListener[] getActionListeners () {
> > > ->> return new ActionListener[0];
> > > ->> }
> > > ->>
> > > ->> public void removeActionListener (ActionListener
> > > ->> listener) {
> > > ->> throw new UnsupportedOperationException ();
> > > ->> }
> > > ->>
> > > ->> }
> > > ->>
> > > ->> Any Ideas?
> > > ->>
> > > ->> Curtney
> > > ->>
> > > ->>
> > >
> > >
> >
>
